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How to create a Matplotlib bar chart with a threshold line?
To create a Matplotlib bar chart with a threshold line, we have to use axhline() method.
Steps
- Set the figure size and adjust the padding between and around the subplots.
- Initialize a variable, threshold.
- Make lists for bars values.
- Get the below and above bar values based on the threshold value.
- Create a figure and a set of subplots using subplots() method.
- Plot bars with x, a_threshold and b_threshold values.
- Add a horizontal line across the axis using axhline() method.
- To display the figure, use show() method.
Example
import numpy as np import matplotlib.pyplot as plt plt.rcParams["figure.figsize"] = [7.50, 3.50] plt.rcParams["figure.autolayout"] = True threshold = 10 values = np.array([8.0, 10.0, 15.0, 9.0, 12.0]) x = range(len(values)) a_threshold = np.maximum(values - threshold, 0) b_threshold = np.minimum(values, threshold) fig, ax = plt.subplots() ax.bar(x, b_threshold, 0.35, color="blue") ax.bar(x, a_threshold, 0.35, color="yellow", bottom=b_threshold) plt.axhline(threshold, color='red', ls='dotted') plt.show()
Output
Updated on: 03-Jun-2021
3K+ Views
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